Spark-plug.



T. LATCH.

' SPARK PLUG.

APPLICATION FILED MAR. 13. 1914.

Patented Nov. 16, 1915.

wi/lmeooeo WW 1m attoznw THEODORE LATCH, OF GALETON, COLORADO.

SPARK-PLUG.

Specification of Letters Patent.

Patented Nov. 16, 1915.

Application filed March 13, 1914. Serial No. 824,487.

T all whom it may concern Be it known that I, THEODORE LATCH, a

citizen of the United States, residing at spark points are of a novel formation so that the accumulation of foreign matter or of water, oil or the like thereon is obviated,

' thereby permitting the spark to take place at all times when called on to perform its function.

Another object of the invention is the provision of a spark plug wherein the spark points are prevented from charring and also the said points are positioned with respect to each other to afford a proper space and thereby allow the proper disturbance for the spark to act.

A further object of the invention is the provision of a spark plug wherein the points are so constructed as to prevent a bridge being formed between the same from the gasolene, Water, foreign matter or -the like accumulating thereon.

A still further object of the invention is the provision of-a spark plug wherein the points will be sustained properly adjusted, thereby avoiding the inefi'ectivenessof the plug when in action.

A still further object of the invention is the provision of a spark plug which is simple in construction, thoroughly reliable and efiicient in its operation, and inexpensive in manufacture. 4

With these and other objects in view, the invention consists in the construction, com bination and arrangement of parts as will be hereinafter fully described, illustrated in the accompanying drawing, and pointed out in the claim hereunto appended.

In the drawing :Figure 1 is a side elevation of a spark plug constructed in accordance with the invention. Fig. 2 is an end view thereof. Fig. 3 is a vertical, longitudinal sectional view through the same. Fi 4 is a side elevation of one of the spark points removed from the plug.

Similar reference characters indicate corspark cent thereto.

respgnding parts throughout the several views in the drawing.

Referring to the drawin by numerals, the lug comprises a seeve-like body 5 which orms the outer shell of the plug and is provided with external screwthreads 6 for avportion of its length whereby it may be screwed into the cylinder of an engine as usual, the remaining portion of the body being formed with wrench engaging surfaces 7 whereby it may bereadily mounted in the engine cylinder. Passed centrally through the body 5 is a binding post'8, the inner end of which is formed with a spark point 9, while the outer end thereof has threaded on the same a binding nutlO whereby an electric wire can be connected to the post between the said nut 10 and a collar 11 adja- Surroundin the post 8 is a lock nut 12 which is detac ably and adjustably threaded in the body 5, the nut being held against displacement on the post 8 between a series of mica or insulated rings or washers 13 which surround the post 8 and are designed to insulate the same from the body 5 and the nut 12, the washers 13 being bound together by the action of the-collar 11 which is threaded on the post 8 so that the post, collar 11, nut 12, and washers 13 will afford a unitary structure.

Spanning the inner threaded -.end of the shell or body 5 of the plug is a U-shaped bridge member 14, the same being formed medially thereof with an upwardly tapered sparking point15 which is held spaced from the sparking point 9 the required distance to permit the umping of a spark between the same, the point 9 being downwardly tapered and is formed with opposed concaved faces 16, the apeiies of the points 9 and 15 being inlaid with co per or platinum 17 which prevents the c arring of the points when the plug is in use. It is of course understood that one current wire is connected to the 0st 8, while the other leads to the body of the cylinder, the sparking plug being connected up in the ordinary well-known manner with an electric circuit. The points 9 and 15 are rranged in alinement with each other and also spaced the required distance apart to permit the jumping of a spark from one point to the other. The'formation of the points will prevent the accumulation of gasolene, water, foreign matter or the like thereon, and thereby prevents the bridging of the same between the points, thus obviat-' ing the ineffectiveness of the plug and at the same time assuring the perfect action of the same when in use.

It is to be understood that the particular shape of the faces of the points are so constructed in relation to each other. to preventf disturbance on the apexes by Water or-OiL The V-shaped 'facings of the. points are {de- 1 signed to hold all liquids, rather than the accumulation thereof on the apexes, thus preventing the burning of a char on either apex of the said points. By reason of the shape of the facings the points will assure a full live spark and also a more. compact spark, spraying of the spark being obviated. v From the foregoing it is thought that the construction andmanner ofoperation of the device Willbe clearly understood, and therefore a more extended explanation has been omitted.

What. is claiined'is:

A spark plug comprising a cylindrical body formed with an internal annular shoulder, a post located centrally Within the body, insulating means surrounding a greater portion of the post, an adjusting nut concentrifCa-lly disposed about the post and held fixed in the insulating means and adjustably threaded in one end of the body to work toward and away from the shoulder, a head formed on the. inner end of the post and having a triangular shaped tip provided with opposite concaved faces, an inlaid point at the apex of the tip, a U-shaped bridge meniber at the opposite end of the body to that engaged by the'nut and having a triangular shaped medial portion registering with the tip, and an inlaid point on the said triangular shaped portion of the bridge piece to cooperate with the point on the tip.

In testimony whereof I'afiix my signature in presence of two witnesses.

THEODORE LATCH.

Witnesses I YV. H. SCHEER, -PETER HEASEL;

Copies of this patent maybe obtained for five cents each, by addressing the "Commissioner of Patents,

- a Washington, D. O. 

